JPH0358631A - Radio communication equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a radio communication device having multiple communication channels.

Conventional technology Conventionally, the device has multiple communication channels, and when the device is on standby, it checks all channels to see if radio waves are arriving, and when radio waves are arriving, it fixes to that communication channel p, and then checks the communication content. A wireless communication device is used to monitor or detect the self-calling radio waves.

Further, in recent wireless communication devices, microcomputers are used as control means to realize many functions. This microcomputer requires a clock for its operation, and its frequency ranges from several hundred KIIz to several Mllz.

Here, the frequency of transmission and reception is determined by the communication channel, and the chronograph frequency of the microcomputer is also fixed using a crystal or the like.

Problems to be Solved by the Invention However, in the above-mentioned FFL system, since there are many communication channels, interference between the transmitting and receiving frequency and harmonics of the microcomputer's clock frequency cannot be avoided.
There was a problem in that noise was generated due to the beat frequency.

1. Countermeasures for this problem include circuit layout and signal redundancy, but none of them can completely prevent the occurrence of the beat frequency, and in the worst case, the channel where the beat frequency occurs cannot be used. It had some problems.

The present invention has been made in view of the above-mentioned prior art, and it is possible to easily prevent the reproduction of the beat frequency by changing the clock frequency of the microcomputer in the case of a communication channel where a beat frequency is generated. This is to provide a wireless communication device that can.

Means for Solving the Problems To achieve this object, the wireless communication device of the present invention has an antenna for receiving waves or transmitting radio waves, and a receiver for receiving radio waves input from the antenna. means, a transmitting means for outputting radio waves transmitted from the antenna, a frequency generating means for generating a transmitting frequency and a receiving frequency of the transmitting means and the receiving means, a communication channel, and a specific communication channel /I/. and a control means for controlling the frequency generating means to generate a transmitting frequency and a receiving frequency of the communication channel in response to the communication channel read from the means.
chronograph generation means for generating a clock input to the control means; and when a specific communication channel is read from the storage means, the chronograph frequency generated by the chronograph generation means is changed under the control of the control means. l11 & is controlled by the clock frequency control means.

With this structure, when the control means reads out a specific communication channel/re from the storage means, it causes the frequency generation means to generate the transmission frequency and reception frequency of that channel, and also causes the clock frequency control means to generate the clock generation means. This will change the generated clock frequency.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a wireless communication device in an embodiment of the present invention. In Figure 1, 1 is an antenna, 2 is an antenna duplexer, 3 is a transmitter, 4 is a receiver, 5 is a microphone,
6 is a speaker, 7 is a PLL circuit, 8 is a control means,
(4j) is formed by a microcomputer and presses a button, and has internal memory that stores communication channels and which communication channel will cause beat disturbance by interacting with the clock of the control means 8 set in advance. 9 is a clock frequency control circuit, which is composed of a transistor 9a and a capacitor 9b. 10 is a clock circuit, which includes a crystal oscillator IQ&, capacitors 10b, 10
C, a resistor of 10 dl, and an inverter IQ6.

The operation of the wireless communication device that has been certified as described above will be explained below. In this advanced example, the channels used for communication are 10 channels from 1 channel to 10 channels, and if beat disturbance occurs at the transmitting frequency of channels 1, 4, and receiving frequency of channel 8, the memory will be stored in 1,000 stages.
It shall be remembered by Party B.

Now, the evening lock frequency output to the control means 8 will be explained. Normally, a low-level signal is output from the control stage 8 to the frequency control circuit 9, and therefore the transistor 9a is turned off. IQ
It is determined by the fundamental frequency of & and the capacitance of capacitors 10b and 10c.

Next, in the transmission and reception operations, a carrier signal modulated by the audio signal outputted from the microphone 5 is outputted from the transmitter 3 and transmitted from the antenna 1 via the antenna duplexer 2. Also,
The received signal is received by antenna 1, and the antenna common 'dF
'; After passing through 2f, it is demodulated by the receiver 4 and output from the speaker 6. The above transmission and reception operations are similar to those of a conventional wireless communication device, and detailed explanation thereof will be omitted.

Next, in the standby state, the control means 8 controls the PLL circuit 7 according to the channel information read from the channel storage means 8a, and generates the receiving frequency of that channel.
The signal is output to the receiving section 4. The receiving section 4 detects the presence or absence of a received signal of that channel by detecting the electric field strength and outputs it to the control stage 8. If an electric field is present, the control means 8 fixes it to that channel. If there is no electric field, the next channel is read from the channel storage stage 8a, the PLL circuit 7 generates the reception frequency of the next channel, and the presence or absence of the electric field is detected in the same manner as described above.

In this way, the channels 1Vk are read out one after another, and a scanning operation is performed to detect the presence or absence of an electric field.

Here, when the 8th channel is read out from the channel storage stage 8a during the scan operation, the current chronograph circuit 1
It is also read out from the channel storage means 8a that it is channel p which generates bee 1-interference due to interference with harmonics of the chronograph frequency where 0 is generated, and at this time, the control stage 8
outputs a high level signal to the frequency control circuit 9. When a high-level signal is output from the control means 8, the 1-transistor 9a of the frequency control in circuit 9 is turned ON.
Capacitor 9b is capacitor 10b of clock circuit 10
will be connected in parallel. Therefore, the capacitor capacity becomes larger, so the chronograph frequency becomes lower,
Beat interference due to interference with the receiving frequencies of 8 channels will no longer occur. The variable range of this clock frequency is within one shape for a clock frequency of several M Ilz,
Control HT = A variable range that does not interfere with the operation of stage 8 and avoids beat disturbance.

Next, when transmitting on channel 4, the channel that generates beat disturbance is read out from the channel memory 1000 stages 8a as described in Section 2, and the 1000 stages control 8a is read out from the channel memory stage 8a as described above. Change the lock frequency.

Effects of the Invention As described above, the present invention provides an antenna for receiving incoming radio waves or transmitting radio waves, a receiving means for receiving radio waves inputted from the antenna, and a transmitting means for outputting the radio waves transmitted from the antenna. , a frequency generating means for generating the transmitting frequency and receiving frequency of the transmitting means and the receiving means, a storage means for storing a communication channel and a specific communication channel, and a frequency generating means for generating a transmitting frequency and a receiving frequency for the transmitting means and the receiving means, a storage means for storing information on a communication channel and a specific communication channel, and reading from the storage means. a control means for controlling the frequency generation means to generate a transmission frequency and a reception frequency of the communication channel in response to a communication channel to be transmitted, a clock generation means for generating a clock input to the control means, and the storage means. When a specific communication channel is read out from the chronograph frequency control r.c., the clock frequency generated by the chronograph generating means is completely changed under the control of the control means. By using the stage, it is possible to easily prevent the occurrence of the same wave number of Be 1, and the effect is great.

[Brief explanation of drawings]

FIG. 1 shows a radio communication device {・1 in one embodiment of the present invention.
It is a block diagram showing ♂f or. 1...Antenna, 2...Antenna duplexer, 3
...Transmitter, 4...Receiver, 5...Microphone,
6.Speaker, 7...PLL circuit, 8...
... Control means, 9... Chronograph frequency iU'
ffI1 circuit, 10-...1...chronograph circuit.

Claims (1)

[Claims] A receiving means for receiving incoming radio waves, a transmitting means for outputting radio waves transmitted from an antenna, a frequency generating means for generating a transmitting frequency and a receiving frequency of the transmitting means and receiving means, a communication channel, and a specific communication channel. a control means for controlling the frequency generation means to generate a transmission frequency and a reception frequency of the communication channel in response to the communication channel read from the storage means; and an input to the control means. and clock frequency control means for changing the clock frequency generated by the clock generation means under the control of the control means when a specific communication channel is read from the storage means. A wireless communication device characterized by: